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IBIS Future Options

VIEWS: 2 PAGES: 6

  • pg 1
									IBIS Specification Direction



           Michael Mirmak
              Intel Corp.
     Chair, EIA IBIS Open Forum
           IBIS Future Direction

            The Futures Team needs to recommend a specification
             direction to the Open Forum



            Key decisions include
                    Which features should be included in which spec. versions?
                    Which versions should be standardized?
                    Which versions require new parser development?




10/25/05                                                              Page 2
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           IBIS BIRD Status
                  Specification Changes Approved
                          BIRD99.1             – AMS Language Versions
                          BIRD96               – [Model Spec] and [Receiver Thresholds] Ordering
                          BIRD95.6             – Power Integrity Analysis using IBIS
                          BIRD94.2             – Clarifications on [Diff Pin] parameters
                          BIRD93.1             – Model and Signal Name Limit Extension
                          BIRD92.1             – Model Termination and Series Elements under [Model]
                          BIRD91.3             – Multi-lingual Logic States Clarification
                          BIRD90.2             – Multiple A_to_D Subparameters Clarification*
                          BIRD89.1             – Keyword Hierarchy Tree
                          BIRD88.3             – Driver Schedule Initialization
                          BIRD87               – Series Pin Mapping Clarifications
                          BIRD74.6             – EMI Parameters
                  Specification Changes Under Discussion
                          BIRD97.2/98 - Gate Modulation Effect
                          ICM-IBIS Linking
                          [External Model] under [Circuit Call]
                          Verilog-A under Multi-lingual extensions
                          User-Defined Measurements
                                                                                Parser change required

10/25/05                                                              Page 3
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           Potential Spec Releases
         1.        IBIS 4.2 then IBIS 5.0
                          IBIS 4.2 is “cleanup” featuring clarification BIRDs only
                          IBIS 5.0 includes all BIRDs where parser changes required
                          IBIS 5.0 delayed to include BIRDs still under discussion
         2.        IBIS 4.2, IBIS 4.x… IBIS 5.0
                          IBIS 4.2-4.x are incremental additions of BIRDs
                          BIRD93 and BIRD95 are included in incremental 4.x
                          Standardize on IBIS 4.x; new parsers needed for some 4.x
                          BIRDs still under discussion delayed until IBIS 5.0
         3.        IBIS 5.0 immediately
                          IBIS 5.0 contains ALL pending BIRDs
                          Hold 5.0 release until all BIRDs under discussion completed
                          Standardize on 5.0 or even 5.x



10/25/05                                                              Page 4
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           Pros and Cons
         1.        IBIS 4.2 then IBIS 5.0
                          Pro: Quick release and standardization on IBIS 4.2
                          Pro: Parser development paid with new 5.0 licenses
                          Con: IBIS 5.0 development will take significant time
                                   Delay of new keywords, features
                                   Do we consider re-architecting IBIS in 5.0?
         2.        IBIS 4.2, IBIS 4.x… IBIS 5.0
                          Pro: High-priority changes can be included quickly
                                   For example, BIRD95.6
                          Con: No money to support new parser before 5.0
         3.        IBIS 5.0 immediately
                          Pro: Parser funds become available quickly
                          Con: IBIS 5.0 development will take significant time
                          Con: Standardization “stuck” on 3.2 before 5.0
                                   No standard for AMS+IBIS for the next 2+ years

10/25/05                                                              Page 5
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  MM’s Personal Recommendation
                  Prepare and Release IBIS 4.2 then IBIS 5.0
                          Implement IBIS 4.2 immediately, with “cleanup” BIRDs only
                          Standardize IBIS 4.2 immediately on approval
                          Include BIRD74, BIRD88, BIRD93, BIRD95 in IBIS 5.0
                  Key Questions Remaining
                          Delay IBIS 5.0 for BIRD97/98? (recommend yes)
                          Delay IBIS 5.0 for ICM-IBIS Linking? (recommend yes)
                                   One-to-one links in short term ONLY
                                   More complex links in 5.x
                          Delay IBIS 5.0 for [Ext. Model]/[CC]? (recommend yes)
                          Delay IBIS 5.0 for Verilog-A? (recommending yes)
                          Delay IBIS 5.0 for user-defined measures? (recommend no)
                  All 5.0 features above should be relatively easily closed



10/25/05                                                              Page 6
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